Yes, I am serious, though you didn't say the sharks came up to you, you just said "riding a whale shark". I'm a certified diver as well, and I remember learning in every level of certification to leave marine life alone, and not to ride or grab animals as it can cause unnecessary stress. It's one thing for sea life to come up to you, but from your first post that wasn't the impression I got
The mantas are awesome- where did you see them?
Here is an eagle ray I saw.. Aside from the nurse shark that I didn't get a shot of, it's the biggest sea creature I've seen.